\begin{tikzpicture}[scale=0.9]
    \tkzDefPoints{0/0/A,  3/0/B,  3.8/2/C,  0.8/2/D}

    \tkzDrawPolygon(A,B,C,D)
    \tkzDrawSegments(B,D)
    \tkzMarkAngle[size=0.6](B,D,C)    \tkzLabelAngle[pos=0.9](B,D,C){$1$}
    \tkzMarkAngle[size=0.6](D,B,A)    \tkzLabelAngle[pos=0.9](D,B,A){$2$}
    \tkzMarkAngle[size=0.4](A,D,B)    \tkzLabelAngle[pos=0.7](A,D,B){$3$}
    \tkzMarkAngle[size=0.4](C,B,D)    \tkzLabelAngle[pos=0.7](C,B,D){$4$}

    \tkzLabelPoints[above](D,C)
    \tkzLabelPoints[below](A,B)
\end{tikzpicture}

